Pub. Number US7116781
Appl. Data 09 20010822
Applicant Digimarc Corporation
Inventor(s) Rhoads, Geoffrey B.
Title Counteracting geometric distortions in watermarking
Abstract A digital watermarking method receives multimedia
data, such as images or audio, in compressed or uncompressed form, and extracts
a digital watermark while counteracting geometric distortions. To counteract
geometric distortion, a watermark reading process translates the data before
extracting the digital watermark. The reading process operates on compressed
data such as JPEG or MPEG images, which are comprised of compressed blocks of
image data.
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